package com.uha.reggie.controller;

import com.uha.reggie.common.ReggieResult;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和文件下载
 * @author uha
 * @date 2023/6/15
 * @apiNote
 */
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;


    /**
     * 文件上传
     * @param file file
     * @return ReggieResult
     */
    @PostMapping("/upload")
    public ReggieResult<String> upload(MultipartFile file) {

            //得到原始文件名
            String filename = file.getOriginalFilename();
            //截取文件名 便于获取后缀名
            String suffix = filename.substring(filename.lastIndexOf("."));
            //防止重复图片名覆盖图片 使用UUID 重新生成文件名
            String newFileName = UUID.randomUUID().toString().replace("-", "") + suffix;

            File dir = new File(basePath);
            if (!dir.exists()) {
                dir.mkdirs();
            }

            try {
                file.transferTo(new File(basePath + newFileName));
            } catch (IOException e) {
                e.printStackTrace();
            }


        return ReggieResult.success(newFileName);
    }


    /**
     * 文件下载
     * @param name name
     * @param response response
     */

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
        //输入流，通过输入流读取文件内容

            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流 写回浏览器 展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];

            while ( (len = fileInputStream.read(bytes) ) != -1 ){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }


    }



}
